Abstract: The invention relates to a method for producing a heat exchanger (1), in particular for a motor vehicle. The invention is characterised in that a sub-assembly consisting or the two connection pipes (4) that supply or evacuate the coolant and at least the upper panel (3) or surface of the heat exchanger (1), which contains the openings associated with the connection pipes (4), are positioned, mechanically pre-assembled and then, together with the remaining heat exchanger (1) parts to be soldered, are soldered in a common work operation. The invention also relates to a heat exchanger (1) that is produced according to said method.